RESTful to Android connectivity
I'm going to write a system for processing taxi orders. It consits of client application, driver application and restfull web service. For now I have only a few POST resources in my server that consumes JSON file and produces plain text. I'm wondering how to resolve the situation when the client need confirmation about the order he made or when the new order is made and has to be delivered to taxi driver app. I am a beginner android developer and I do not know which tools should I consider to achieve it. Is it good idea to use a service that checks let say every 30sec for new order/confirmation or shuld I use another solution for example let REST to connect directly to the particular android device?
Thank you in andvance for your response.